transformers

1b57de8d - Make `output_dir` Optional in `TrainingArguments` #27866 (#35735)

Make `output_dir` Optional in `TrainingArguments` #27866 (#35735) * make output_dir optional * inintaied a basic testing module to validate and verify the changes * Test output_dir default to 'tmp_trainer' when unspecified. * test existing functionality of output_dir. * test that output dir only created when needed * final check * added doc string and changed the tmp_trainer to trainer_output * amke style fixes to test file. * another round of fixup --------- Co-authored-by: sambhavnoobcoder <indosambahv@gmail.com>